[C++ Patch] PR 50594 (C++ front-end bits)

[Paolo Carlini]

Hi,

thus, per the discussion in the audit trail, I'm proceeding with 
decorating with __attribute__((externally_visible)) both the 8 new and 
delete in <new>, and the 4 pre-declared by the C++ front-end. The below 
is what I regression tested successfully, together with the library 
bits, on x86_64-linux.

I'm also attaching, for convenience, the library work (I took the 
occasion to adjust noexcept vs throw(), etc, otherwise the patch would 
be tiny)

What do you think?

Thanks,
Paolo.

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